试用双曲线分析法预测水泥土的后期强度

通过无侧限抗压强度试验,测得不同掺入比水泥土试样在不同龄期情况下的无侧限抗压强度。将不同掺入比的水泥土无侧限抗压强度与龄期之间的关系进行回归分析,可以对水泥土后期强度进行预测。     

水泥钢渣土用于公路底基层的无侧限试验研究

采用马鞍山钢渣公司的钢渣为研究对象,通过系统的室内试验,分析研究在水泥稳定土中掺入适量细钢渣代替部分土后,混合料的无侧限抗压强度的变化情况.结果表明钢渣取代部分土以后的水泥稳定土的无侧限抗压强度比不掺钢渣的情况有明显提高,提高幅度在30%～150%之间;水泥钢渣土混合料的抗压强度随钢渣掺量的增加,先增长后降低,掺量在20%～40%之间时,强度较大,达到峰值段.     

水泥稳定土中水泥的掺量对其早期无侧限抗压强度的影响

分析水泥稳定土混合料中水泥掺量对水泥稳定土早期无侧限抗压强度的影响,并得出结论.     

高炉矿渣稳定基层可行性研究

本实验选用不同掺量曲高炉矿渣微粉与水泥石灰进行复配来稳定含盐率较低的素土,并测定其无侧限抗压强度,在此基础上探讨了该种添加料的施工工艺.     

水泥土深层搅拌桩在堤防地基加固工程中的应用

水泥土深层搅拌桩以水泥为固化剂,通过专用的深层搅拌机,在地基深部就地将水泥与土搅拌成加固体。应用该法处理地基可增加地基承载力,减小沉降。结合实例工程,简述了水泥深层搅拌桩的施工工艺及技术要求。     

改善水泥稳定碎石基层早期裂缝的措施

近年来,配合比设计良好的水泥稳定碎石因其强度适中、稳定性好、施工方便等优点,已被作为性能良好的基层材料在高等级公路施工中得到了广泛的应用。但施工过程中由于过分强调无侧限抗压强度而忽视了其他一些因素的影响,施工初期均出现了比较普遍的裂缝而影响其后期的使用效果。因此,提出切实可行的改善水泥稳定碎石基层早期裂缝的方案已经迫在眉睫。     

浅谈水泥土搅拌桩的地基检测方法

水泥土搅拌桩是指利用水泥或水泥系材料为固化剂、通过特制的深层搅拌机械、在地基深处就地将原位土和固化剂(浆液或粉体)强制搅拌、使土体硬结成具有整体性水稳性和一定强度的水泥加固土、从而提高地基土强度和增大变形模量的一种复合地基.     

小型水利工程基础处理中水泥土的应用

软弱地基问题在水利工程中非常常见。通常我们采用水泥土置换的方法来解决这个问题。本文主要从水泥土的使用技术以及原理来说明水泥土在小型水利工程基础处理中的重要作用，并分析说明水泥土的应用方法以及这些方法的优缺点。     

水泥土搅拌法在地基处理工程中的应用与分析

我国地域广大,有各种成因的软土层,其分布范围广、土层厚度大。这类软土的特点是含水量高、孔隙比大、抗剪强度低、压缩性高、渗透性差、沉降稳定时间长。由于软土地基不良的建筑性能,因此需要进行人工加固。作为一种新颖的软土地基加固方法,水泥土搅拌法对于提高软土地基承载力,降低建、构筑物沉降量都十分有效。本文主要介绍了水泥土搅拌法的作用机理、适用范围及影响水泥土强度的主要因素,并结合实例,着重分析了在设计过程中如何合理的选择主要设计参数。     

软基处理水泥土深层搅拌桩施工控制

水泥土搅拌桩地基soil-cement mixed pile foundation利用水泥作为固化剂,通过搅拌机械将其与地基土强制搅拌,硬化后构成的地基,是软基处理中比较常用且有效的一种方法.水泥土深层搅拌桩的成桩质量与土质条件、水泥掺入量、施工工艺等密切相关,由于现场的工程地质条件复杂、前期准备工作不足、施工工艺不完善以及施工机械不满足要求等经常会引起成桩质量的不稳定.本文总结了软基处理水泥深层搅拌桩在试验桩施工、施工准备阶段、施工阶段和质量检验等方面的施工控制措施,通过实施严格的施工控制,确保软基处理水泥土深层搅拌桩的施工质量.     

一种自适应DCT域数字视频水印方案

数字视频广播中的水印一般应当能够在视频编码的同时完成水印的嵌入。针对MPEG2视频压缩编码选用DCT变换进行数据压缩，提出一种自适应DCT域数字视频水印方案，数字水印主要嵌入在视频码流的I帧，嵌入强度和位置根据一定的准则自适应选取。实验结果显示，在不可感知性和鲁棒性方面，自适应方案具有良好性能。     

采样率对宽带LFM信号数字脉压的影响

宽带LFM(线性调频)信号数字脉压中，当采样率不能取得足够高时，在不同的采样率下脉压输出结果将发生变化。此时，采样起点和多普勒频率的变化也将影响脉压结果，并且两者对脉压结果的影响有一定的等效关系。通过较全面的仿真，为宽带LFM信号数字脉压的工程应用中合理选择采样率提供了参考。     

粉煤灰在高性能混凝土中的应用

本文通过正交设计,在高性能混凝土中掺入粉煤灰等量取代水泥,试验研究了强度等级为C50的高性能混凝土的配合比及测定了相应的混凝土性能,在分析讨论粉煤灰的掺量对高性能混凝土工作性及强度影响的基础上,指出了在配制高性能混凝土中掺入粉煤灰及高效减水剂双掺技术的技术途径,从而得到最佳配合比.     

农用硝酸钾与菱镁水泥制品联产工艺

先以硝酸、氯化钾与菱苦土为原料反应制取硝酸钾,分离硝酸钾所得母液主要是氯化镁溶液,在氯化镁溶液中先后加入填充料、改性剂、菱苦土等原料,充分搅拌均匀制成菱镁水泥料浆,然后将料浆注入模具中成型为菱镁水泥制品.本工艺流程简单,原料价廉易得,无污染,投资低,生产成本低,产品市场好.     

Firm resources,cultural distance and simultaneous international expansion in the retail sector

Despite the fact that many firms simultaneously expand into multiple new markets, we know very little about why firms choose this type of international expansion instead of sequentially entering new markets. Drawing on the resource-based view (RBV) we argue that in order to engage in simultaneous international expansion firms have to be able to draw on intangible assets, be financially strong, and have international experience that will enable them to reduce and/or shoulder the strains on managerial resources, time compression diseconomies and costs of simultaneously entering multiple new overseas markets. We further expect the strength of these associations to be moderated by the cultural distance between a firm’s home country and newly entered countries. Our analysis of the international expansion of the sales operations of 102 retailers over the period 2003–2012, during which these retailers sequentially or simultaneously entered into a total 836 overseas markets, largely supports our hypotheses. Our study underlines the usefulness of the RBV for understanding simultaneous international expansion as an important phenomenon that has received only scant scholarly attention to date.     

The Persuasive Effect of Circadian Arousal,Endorser Expertise,and Argument Strength in Advertising

Abstract

This research investigates the influence of circadian arousal, endorser expertise, and argument strength of a message on attitudes toward the brand and purchase intention. The quasi-experimental design is a 2 (high versus low endorser expertise) × 2 (strong versus weak arguments) × 2 (morning-type versus evening-type persons) × 3 (advertisement viewing time: 10 a.m., 3 p.m., or 8 p.m.) between-subjects factorial design with 602 Thai female adults. The results are not in complete accordance with predictions from the Elaboration Likelihood Model. For both types of persons, higher argument strength leads to better attitudes toward the brand and higher purchase intention, regardless of endorser expertise and advertisement viewing time. When morning-type persons view the advertisements in the morning and evening, the high- and the low-expertise endorsers have no different effect on attitudes toward the brand, regardless of argument strength. When they view the advertisements in the afternoon, the high expertise endorser creates better attitudes toward the brand than does the low expertise endorser, regardless of argument strength. For evening-type persons, endorser expertise does not affect either of the dependent variables. Theoretical and managerial implications of the study are discussed.     

浅谈天津滨海地区软土地基处理技术

通过对软土地基工程特性的介绍,结合天津滨海地区相关工程施工中的实践经验,总结和提出了软土地基处理与加固的方法,以提高软土地基的强度,保证地基的稳定,减小地基的不均匀沉降.这些方法可供类似工程参考.     

基于平方加权质心特征的快速分形图像压缩编码

分形图像压缩利用自身图像具有的相似性,结合压缩仿射变换减少图像数据的冗余来实现图像数据的压缩,具有压缩比高、恢复简单的特点。然而,分形图像压缩编码也具有编码时间长、计算复杂的缺点。为了解决上述的缺点,提出了基于平方加权质心特征的快速分形图像压缩编码算法,利用平方加权质心特征可以将基本分形图像压缩编码过程中的全局搜索转化为局部搜索,限定搜索范围,减少码本数量,在巨大图像信息量传输和存储过程中,在一定程度上缩短了编码时间。将平方加权质心特征快速分形图像压缩编码算法和双交叉和算法、改进叉迹算法、规范五点和算法进行比较,仿真结果表明,所提算法在恢复质量可接受情况下,编码时间具有巨大优势。     

Strength of Preference in the Graph Model for Conflict Resolution

A new preference structure that includes a simple relative measure of strength of preference is developed and integrated into some of the stability definitions for the graph model for conflict resolution. In this triplet preference structure, a decision-maker may greatly prefer or prefer one state or scenario to another, or may be indifferent between them. Four stability definitions (solution concepts), Nash stability (R), general metarationality (GMR), symmetric metarationality (SMR), and sequential stability (SEQ), are extended to include strong and weak stabilities for the case of conflicts with two decision makers. Theorems that clarify the interrelationships of the strong and weak versions of these solution concepts are presented. The application of this new preference structure and the associated solution concepts is demonstrated in an environmental conflict model, called the Sustainable Development Conflict. This case shows that valuable strategic insights are gained when strength of preference is integrated into the stability analysis.     

Advertising time expansion, compression, and cognitive processing influences on consumer acceptance of message and brand

This article examines the nature of consumer process involvement and cognitive processing of advertising content as mediating variables between commercial message executions (e.g., broadcast time compression and expansion and using broadcast versus print media) on attitude and behavioral intentions. The article proposes a framework that builds on the prior work of Krugman, Wright, and MacInnis and colleagues; the framework includes hypotheses of an advertising execution and processing involvement interaction effect on cognitive processing of commercial messages and a substantial direct effect of cognitive processing on attitude and behavioral intention. The article includes details of an experiment testing hypotheses in the framework. The findings provide strong support of the hypotheses. Implications for advertising strategy include adopting a conservative view on the use of time compression in advertising commercials and nurturing low consumer processing involvement of commercial messages.